Nonlinear Optimal Disturbances in Compressible Shear Flows

2021 ◽  
pp. 87-95
Author(s):  
Zhu Huang ◽  
Tim Flint ◽  
M. J. Philipp Hack
Keyword(s):  
Shear Flows ◽  
Optimal Disturbances

Large organized structures in stably stratified turbulent shear flows.

2020 ◽  
Author(s):  
Andrey Glazunov ◽  
Evgeny Mortikov ◽  
Grigory Zasko ◽  
Yuri Nechepurenko ◽  
Sergej Zilitinkevich
Keyword(s):  
Shear Flows ◽  
Spatial Scales ◽  
Basic Research ◽  
Field Measurements ◽  
Stable Stratification ◽  
Thin Layers ◽  
Turbulent Shear ◽  
Large Temperature ◽  
Turbulent Shear Flows ◽  
Optimal Disturbances

<p>We analyzed the data of the numerical simulation of stably stratified turbulent shear flows. It is shown that, along with chaotic turbulence, the flows contain large organized structures. In the temperature field, these structures appear as inclined layers with weakly stable stratification, separated by very thin layers with large temperature gradients. The existence of such layered structures in nature is indirectly confirmed by the analysis of field measurements. An increase of the turbulent Prandtl number with increasing gradient Richardson number was fixed in simulation data. The hypothesis is proposed that physical mechanism for maintaining of turbulence in supercritically stable stratification is connected with the revealed  structures. It is shown that the spatial scales and the shapes of the identified organized structures can be explained using the calculation of  optimal disturbances for the simplified linear model.</p><p>This study was supported by the Russian Foundation for Basic Research (grants nos. 18-05-60126,  20-05-00776) and by Academy of Finland project ClimEco no. 314 798/799 (2018-2020).</p>

Optimal Disturbances in Compressible Boundary Layers

AIAA Journal ◽  
10.2514/1.517 ◽  
2003 ◽  
Vol 41 (12) ◽  
Author(s):  
Anatoli Tumin ◽  
Eli Reshotko
Keyword(s):  
Boundary Layers ◽  
Compressible Boundary Layers ◽  
Optimal Disturbances

Monotonically integrated large eddy simulation of free shear flows

AIAA Journal ◽  
1999 ◽  
Vol 37 ◽  
pp. 544-556 ◽  
Author(s):  
C. Fureby ◽  
F. Grinstein
Keyword(s):  
Large Eddy Simulation ◽  
Shear Flows ◽  
Eddy Simulation ◽  
Large Eddy
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